How to utilize Flink's TestHarness class?

问题

I need to test a CoFlatMapFunction that shares state. Through my reading I have come to conclusion I should use the TestHarness class per: https://ci.apache.org/projects/flink/flink-docs-stable/dev/stream/testing.html#testing-checkpointing-and-state-handling

Since it is not apart of the public api, I cannot figure out how to import it without copy and pasting the class itself. I thought it maybe in flink-test-utils-junit, but it was not as well.

回答1:

You'll need to add these 4 dependencies to your project (or the 2.12 versions, if that's the version of scala you're using):

    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-test-utils-junit</artifactId>
        <version>${flink.version}</version>
    </dependency>

    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-streaming-java_2.11</artifactId>
        <version>${flink.version}</version>
        <scope>test</scope>
        <type>test-jar</type>
    </dependency>

    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-all</artifactId>
        <version>1.10.19</version>
        <type>jar</type>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-runtime_2.11</artifactId>
        <version>${flink.version}</version>
        <scope>test</scope>
        <type>test-jar</type>
    </dependency>

I've written an example you can find on github that might be an easier starting point. The application being tested is described in the online Flink training.

来源：https://stackoverflow.com/questions/54717003/how-to-utilize-flinks-testharness-class